Computing attachment for type-writers.



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COMPUTING ATTACHMENT FOR TYPE WRHERS.

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COMPUTING ATTACHMENT FDR TYPE WRITERS.

APPLICATION FILED ocT.1l. 1900.

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which is preferably shafts will rotate until an indexin UNrrnn sTA'TEs PATENT oFFIon.

BENJAMIN M. mas JARDINS, OF WEST HARTFQRD, CONNECTICUT, ASSIGNOR TO 101m '1. UNDERWOOD, or BROOKLYN, NEW YORK.

Specification of Letters Patent.

Patented July 9, 1918.

Apfilicatidn m detolier 11,1900. Serial no. 32,746.

To ell whom it may coneern Be it known that I, REX. mun M. Dias JAmnN's, citizen of the Unite States, residing at Vest Hartford, in the eo'imty of Hartford and State of Cdnneeticu't, have invented certain new and useful Impromments "in computing Attachments for Type- -i vriters. in which the following is a specification.

My invention relates to computing machines. and is herein illustrated as applied to a combined typewriting and tampering machine. in which the numeral keys of the typewriter may be connected to t h' e'eo mputine mechanism to control the "same.

he con'ipiiting mechanism includes a gang of computing wheels, "which wheels may e engaged miafim by a denominational selector or master wheel to thin them. This master wh eel ma y be power-driven, and the computing wheels turned thereby to an extent determined by the 'n'umera'l key operated.

Said master wheel is driven by a shaft foia ned in line with an indexing shaft to which it is coupled by the operation of every numeral key, so as to turn therewitli. hen so coupled, both stop, which has been positioned by the numeral key eperated, intercepts a stop on said indexing shaft, and so arrests the same, together with the master-wheel shaft to which it is coupled. Upon return of the key, the shafts are uncoupled.

The eomputing wheels may be arranged in a totaliyer fast on the typewriter frame; and in order that the computations may take place in their proper order, the master wheel is fed in a direction. opposite to'that er the typewriter earriage. To attain this end there is preferably provided a computing machine carriage which controls the eiigagement of the master wheel wit the computing wheels. An eseapem'en't feeds said computing machine carriage one step to the right at every operation oif a numerai key. M eans nmy also be provided for lokihg the computing machine escapenient against aeeidental displacement.

This computing mechanism will enable numbers wr1tten in any position oh the work-sheet in the typewriter to be properly added just as though they were positioned in columns. This is facilitated by the use of a tabulating device which sets the master wheel to the desired denominational position, so that will engage successively ust as many coin utin wheels, in traveling to the 'units whee as there are digits in the number to he recorded. Vhen numbers are not ositioned in columns, the computer tabulatmg mechanism may be disconnected from the carriage of the typewriter. To enable this to be done, the typewriter tabulating mechanism may comprise a shaft whieh is alined with a rock shaft used for posifioning and returning the eomputin machine carriage. A handle in said tabtfiating device may also comprise a eonplin arm arranged to be rocked so that it wil turn either of said shafts or "both simultaneously. This construction enables a single handle to be used for tahulatin on the typewriter and for properly positioning the computing egnanis At the operation of the tabuluring device, the computing carriage is drawn to the left to a distance dependent ii'pon thenuinber of digits in the number to be computed and written. 1 y

The numeral keys are preferably normally disconnected from the computin ineha ni'sm; but may he com as to operate the same by means of the tabulat'ing device. For this purpose said tabulating device may be. arran ed to swing a universal member or bail beneath the numeral keys, to control the teeterin o-"eration and also the feeding of the compiler carriage. After a digit is writteh the units position in any computation, an may move the bail operated by the numeral keys to ineffective position, and tlieielfy d i'sc oiiiiect the computing mechanism from the typewriting mechanism.

The eompn'tiii'i ineehanism preferably power-driven, the power being obtiiified from a driving spring which is wound up every time the eomputin mechanism is conneted to the typewriter, Said spring is preferably connected by gearing to the shaft of the master wheel in such a wit that it constantly tends to rotate said s aftyso, when said master wheel released said spring will cause said master iibhel to rointo the computing wheel it then engages until arrested. In moving the aforesaid universal bail to effective position, an arm may be swung to wind up the driving spring aforesaid.

The computing mechanism proper may comprise computing wheels which are normally held locked, thus preventing any accidcntal movement of said wheels due to jarring of the mechanism or friction from adjacent wheels. This lock may comprise a cam member which is swung between the teeth of a carrying wheel, which. carrying wheel is always in mesh with its dial wheel, there being one carrying wheel for each computing wheel. The dial or computing wheel in mesh at any moment with the master wheel is referably held free from said locking arm y moving the cam to an inoperative position. This movement may be accomplished by means of an extension on the rod which gives said master whee]. its scriatim. movement, said rod carryinga cam surface which Swings said locking cam to inefi'ective position.

For each of said computing wheels there may be a carrying lever, which a spring normally tends to move, so as to carry over a unit onto said wheels. Said lever, however, may be normally restrained by a dog which catches in a hook on a trip lever operated by a carrying shoulder on the wheel next lower in denomination. hen said trip lever is moved by said carrying shoulder, it releases said carryin lever, so that said lever swings a drive paw 'into engagement with the carr ing wheel next higher in denomination, t us movingit one unit space; and said carrying lever, in so being operated, moves to ineffective position the lockin cam for the carrying wheel which is t on being turned through a unit space.

As said carryin pawl drives said carrying wheel, a small og or detent on the point of said carrying lever may look between two adjacent teeth on said carrying wheel and so make certain that said carrying wheel is moved to the proper extent. The carrying levers hold any carrying wheel locked which they have operated on. Said locks may be released and the whole computing machanism may be reset to normal position when the tabulating handle is moved to reset the nnister'wheel for beginning a new computation.

Other features and advantages will hereinafter appear.

In the accompanying drawings, Figure l is a plan view of a Remington typewriting machine. No. 2, with the computing attachment and tabulating device connected thereto.

Fig. 2 is a plan view of the front half of a typewritlng machine showing the inven tion applied thereto.

carriage escapement mechanism Fig. 3 is a plan view of the computing mechanism, the typewriting machine and setting lever being detached.

Fig. 3 is a front elevation of the parts shown in Fig. 3, and including the setting lever.

Figs. 4 and 5 are sections on the lines H and 55, respectively, of Fig. 3.

Fig. 6 is a partial rear view of the driver feeding mechanism.

Fig. 7 is an enlarged plan view of parts shown at the right end of Fig. 3.

Fig. 8 is an enlarged right end view of the computing devices, parts being broken away.

Figs. 9 and 10 show the carrying and indicating devices in two different positions.

.Figs. 11 and 12 are details.

Fig. 13 is a detail of one of the clutches.

Fig. 14 is a detail of a part of Fig. 7.

Fig. 15 is a detail of the clutch-operating lever shown in Figs. 2 and 3.

Fig. 16 is a view, similar to Fig. 5, illustrating a modified device for manipulating the bails 84 and 86.

Fig. 17 is a detail of said device.

Fig. 18 is a detail in section on the line 1818 of Fig. 16.

Fig. 19 is a plan view of the mechanism shown in Fig. 6.

Fig. 20 is an end view of the computer escapement.

Fig. 21 shows the connections of a carriage-release ke Fig. 22 is a detail view and their actuating keys.

Fig. 23 is a view similar to Fig. 2, but showing the tabulating mechanism at the end of its stroke, with many of the typewriter keys removed in order to show the details of the computing connections.

Fig. 24 is a rear view of the computing showing but when rocked by of two type-bars most of the parts seen in Fig. 6, the escapement dogs have been the depression of a numeral key.

Fig. 25 is a view similar to Fig. 24, but shows said escapcment mechanism in the act of being positioned by the tabulating handle.

Fig. 26 a view similar to Fig. 15, but shows the tabnlating handle connected to operate the typewriter tabulating mechanism alone.

Fig. 27 a plan view showing the tabulating handle at the moment of being moved.

Fig. 28 is a section like Fig. 20, but showing parts in the position shown in Fig. 24.

Fig. 29 is a section slmilar to Fig. 9, showing thencompnting and carry-over devices at the beginning of a carry-over operation.

Fig. 30 is a similar section showing the the carry-over mechanism when it is being reset by the tabulating handle.

Fig. 31 is a plan view of the dial wheels and the carry-over devices.

(i ll Fig. 32 is a view similar to :Fig. 16, but showing the '9 key depressed and arresting the stop-shaft.

Fig. 33 is, a view similar to Fig. 5, but showing the handle 171 depressed to feed the computing carriage one lettenspace without doing any computation.

Fig. Si is a view similar to Fig. 17, but showing parts in the position seen in Fig.33.

Fig. 35 is a rear uiewef part of the setting.

rod and part of its connection to the resetting mechanism for the carry-over mechanism.

Fig. 36.is a view similar to Fig. 8, but shows the winding mechanism and certain other parts in the normal idle 0f said Winding mechanism.

ig. 37 is a similar View, showing the winding mechanism at the end of a winding stroke.

Fig. 38 is a section through Fig. 14.

Numeral and alphabet key levers 68 operate type as is usual on 9. Remington typewriting machine. Each numeral key lever (58 also controls at will, in a manner described hereinafter, nutmersil or dial Wheels 3i by means of a driver or master wheel 33 arranged in a manner described hereinafter to engage said dial wheels seriatim.

Each numeral key lever '68 loosely engages an arm 67 (Figs. 5, {t6 and 32) to swing it down about its pivot, these arms 67 be ng pivoted side by side upon a horizontal rod 66. By reason of the depression of any arm (37, an indexing stop '65 thereon is swung down into the path of a corresponding index-tooth or stop 59 on a horizontal revoluble shaft 58, which is driven by power, and may be regarded as an indexing shaft for the dial wheels 81. The indexing stops 59 are arranged helica lly upon said shaft 58, while the indexing stops are arranged in a straight row, so that the extent of revolution 0. the power-driven shaft 58 depends upon which stop *65 is set, that is, upon which numeral hey is depressed.

This variably-rocking indexing shaft 58, which returns to normal position after each computation, is used her the purpose of controlling the extent of rotation of the master wheel 33 and hence of the dial wheels with which it successi 'ely engages. The master wheel tends normally to rotate, but is under restraint, and is permitted by any numeral key to escape from restraint and to turn as far as may be determined by said key through the instrumentality of t as indexing shaft 58. For this purpose said shaft is caused to connect with the master wheel at every numeral key stroke.

A shaft 34, (Fig. 7), on which the mas ter wheel 33 is splined (to permit it to engage successive computing wheels while con trolled by said shaft), is under constant tendency to be turned by means of a spring encircle shaft 58.

motor shaft 135 (Figs. 8 and 38). and so tends to tltl'll any compnting wheel 3.1 with which the master wheel engages.

Said master wheel 33 is, however, normally prevented from turning by means of an cscapement tooth orstop which (Figs. 7. 8 and 3(3) normally intercepts one of the teeth 72 of an eseapement wheel on the shaft an of said master wheel there being, in the prom/lit example. ten such teeth or projections 72.

At "the depression of a numeral key, said stop 70 is swung to release the tooth or wheel 72, allowing said power-driven masterwheelshaft34*to rotatc; but at the same time said indexingor stopgshaft 58, which is alincd with said master-Wheel shaft 34, is automatically clutched to said master-wheel shaft by means of a lug or coupler 75, (Fig. 7a. which engages a teeth 72 to couple shaft 58 to shaft 34. Said stop shaft 58 is now turned by power-driven shaft '34 until an indexing stop 59 on 58 is intercepted by the stop 65 that has been swung down by the numeral key operated (see Fig. in this way the master wheel is turned by power at the stroke of every numeral key until the indexing shaft is arrested by the stop 65 interposed by said numeral key. For rotating the indexing shaft 58 back to normal po sition after it is uncoupled from drive-shaft 34, there is provided a spring 62, which may Said spring normally holds a stop 60 on said shaft against a stop 61 on the frame (see Figs. 3 and Spring is weaker than the motor spring.

For enabling the keys to operate the coupler 7'5 and the escape-merit stop or dog 70, there is provided underlying the nuiiie'l'al keys, to be depressed thereby, a universal bail 84 (Fig. 3). This hail overlies an arm 83 on a rock shaft 82, which rock shaft swings said cscapcment stop TO by means of a link (Fig. 3G). pivoted at one end on an arm '81 fast on shaft the other end of this link 80 being pivoted to an arm 79 fast on a rock shaft 71, as shown in Fig. 3 On said rock shaft 71 there is also fixed a yoke 77 (Figs. Q, 7 and "23) carrying pins 78, to reciprocate the coupler'75 into and out of mesh with the teeth or projections 72; this movement being effected by means of a collar T6, forming part of said coupler and having a peripheral groove wherein said pins 78 work. flu the end of said stop shaft 58 is fast a collar 1") (Fig. ll), having a slot 74 in which said coupler T5 fits and slides as it moves into and out of mesh with said teeth 72, whereby the "shafts 34 and 58 are automatically coupled and uncoupled as the keys operate.

The bails 8- and 86, it will be noted. are capable of swinging freely on the rock shaft s on which they are pivoted, and operate said rock shafts by means of the arms 91 and 83,

which underlie said bails. Said bail 81 is normally held in its upper position by a spring 88, arranged to engage a rock arm 89 on rock shaft 82; and a spring 124, engaging rock arm 125 fast on rock shaft 90, is arranged to normally hold the bail 80 raised.

At the operation of the numeral keys, the master-Wheel 33 is fed or shifted laterally step by step, to engage seriatim with the computing wheels, by means of a rod 99, extending transversely of the machine, and driven to the right by a spring 111 (Fig. 3). This rod forms a computing machine carriage, to which is secured a feed-rack 102, (Fig. 6), in which key-controlled feeddogs 103 and 101 are arranged to work, to permit said rack and carriage to be fed to the right, as viewed from in front in Fig. 3

The rod or carriage 99 carries the 1naster- Wheel 33 transversely. so as to engage the computing wheels successively, by means of a finger or pointer 100, which has a yoke shaped arm 98 to engage a groove in masterwheel 33.

The feeding of the master-wheel carriage is effected each time that any numeral key is depressed. The key rocks down the bail 84, as above described, and the bail rocks bail 86, thus swinging the rock shaft 90 (by means of rock arm 91 fast on said shaft), so to move the flexible or swinging feed-dog 101 out of said rack, and also to move fixed dog 103 into said rack. Previous to the return stroke of said numeral key, said flexible or swinging dog 104. will have been snapped over by a spring 109 (see Figs. 24- and 28) so that it Will mesh with the next tooth of said rack, thereby permitting said rack to feed to the right, one space, as usual in typewriting machines. Thus it will be seen that on the return stroke of a numeral key, said rack is fed forward one space, and the master-Wheel is moved to engage With the computing wheel next lower in denomi nation. 7

In operating a numeral key, index-stop arm 67 is swung down to determine the ex tent of computation, and at the same time bail S4 is depressed. rocking shaft 82 by means of arm 83 (Fig. 7), and depressing arm 81 on the end of said shaft (Figs. 7 8 and 36), thrusting down link 80, and by means of arm 79 (Fig. 3*) rocking the shaft 71, thus both withdrawing the escapeinent dog 70 from the tooth 72 of the escapement wheel, and by means of arm 77 coupling the indexing shaft 58 to the master-wheel shaft 34 on which said escapement wheel or teeth 72 are fixed; said shafts being then rotated by the spring shaft 135 until the depressed indexing arm 67 arrests the corresponding index stop 59 on shaft 58. Hence the masterwheel rotates from 1 to 9 oints, according to the key operated; and t e dial wheel 31 that is at that time connected to the masterwheel, is rotated to the same cxent. During the down-stroke of the key, the masterwhcel carriage remains unmoved, since the bail 84, in depressing bail 86, and swinging the rock-shaft 90, merely moves the feeding dog 10-1 out of the rack 102, and the fixed or detent dog 103 into said rack.

Upon the relief of the numeral key from pressure, the bails 86 and 84 rise, the shafts 34 and 58 are uncoupled, the escapement dog 70 rengages the teeth 72, and the uncoupled shaft 58 is rotated back to normal position by its spring 62. At the same time the rock shaft 90 returns to normal position, Withdrawing the detent dog 103 from the rack, which now advances, carrying with. it the master-wheel 33. At the same time that the dog 103 was withdrawn, the feeding dog 104 was let into the next notch in the rack, so that the carriage is permitted to feed one step, until the master-wheel reaches the next lower computing wheel.

For the zero type key there is provided the separate depressible bail 86, Which may be arranged to underlie said bail 84, so that aforesaid rock arm 91 underlies one end of said bail 86; While the rock arm 83, which operates the uncoupling and coupling of the master and indexing shafts 34 and 58, is not operated by said bail 86. This will relieve the zero key of operating said coupling, but at the same time arranges so that the zero key feeds the master-wheel carriage to the right every time zero is Written. The carriage B of said Remington typewriter illustrated in the drawings usually comprises a rack-bar which engages with letter-feeding or carriage-escapement dogs seen at XX in F ig. 1. By this common construction the carriage B in said Remington machine is fed a step at every stroke of an alphabetor numeral key.

Provision is made for adjusting or tabulating both the twpcwriter carriage B and the adding machine carriage 99 to the position where it is desired to begin the writing and adding of a number, and also for effecting separate adjustment when desired. The tabulating may be controlled by means of a handle 10 (Figs. 2, 15, 26 and 27). This handle 10 may be caused to engage a vertical rock shaft 11; said rock shaft having fast at its lower end. as seen in Figs. 3, 3 and 23, a rock arm 50 which, by means of a link 51, is pivotally attached to a setting rod 52. Fast on this setting rod is an arm 112 extending forwardly of the machine (see Figs. 3, 3, 5 and 23), so that it normally lies just to the right of the idle position of the computing carriage escapement-rack 102 (see Fig. 6). It should be noted in Said Fig. 6 that the mechanism is viewed from the rear and that, therefore, the arm 112 is at the left, as viewed in said iga rmeo figure. Thus when rod 52 is drawn to the left, as viewed in Fig. 3. it will strike said eseapement-rark 102 and draw said rack to the left (see Fig. 23). The deseribed' movement would be toward the right at Fig. 6, whieh is a rear View. The dog 103 is normally out of engagement with the rack, and so does not interfere with the movement of the rack to the I'ightof Fig. 6. The dog 104 during such movement of the rack, clicks idly over the beveled surfaces of the rack teeth, being pivoted at 106 to permit it to yield as the raek moves back preparatory to beginning a new computation.

Said tabulating handle 10 may turn idly about said rock shaft 11, but may be lOLliEkd thereto by means of a locking bar 13 pivoted on said handle and arranged to be normally held by a spring 13 in such position that it will lie within a slot in a collar 12 fast on said rock shaft 11, Whreby the computer carriage may be tabulated independently of the typewriter carriage. Said locking bar 13 will be lifted out of'said slotif it is depressed (see FigtfZG) by thefinger of the operator at its outer end. so in that case said tabulating' handle 10 may turn idly with respect to said reek shaft 11, whereby the typewriter carriage may be tabulated independently of the computer Carriage.

The tabulati'ng handle" 10 also comprises an arm 19, in which is guided a pawl 16, which may serve as an indicator for the amount said arm is mowed; and. for this purpose, said pawl is oflset from the plane of its rook arm 19 so'thatsaid pawl is p0- sitioned to move over a" rack 20. which is suitably graduated (see Fig. 3) As shown herein, said rack is so gradiiated that the first tooth marked 1 will show that the handle has been sl'lfiieiently movedtobring the master Wheel 33 to engage with the units computing wheel; the seeond, tooth marked 2 will show that said master Wheel is in engagement with the tens coinpnting'wheels, and so forth. The pawl 16 is pivotally mounted on the rook arm'19; which rock arm is pivoted'onthehandle' 10,:md an ex tension 19 of said M11119 lies adjacent-the handle 10, so that by manually swinging rock arm 19*, the pawl' ldmay be" swung clear of the teeth of the 1ack20 (see Fig 27) against the tensiorrof aspring 17, which normallfiv holds it in engagemeiit witli said' rack. The pawl 16' normal lyrests in a notch in an extension 04* thescale18, ahdfit shnihl always be returnedto normal pbsititmafier the tabulating'operation, thus holding the arm 112 clear of the travel ofthe computer carriage. I

Said tabulating" handle IOis also arranged to turn an upWardl y-entending rock shaft 15 against a" springtfi by 11188118 of said locking. arm 13, and throughsa'id reek shaft I5'sai'd handle may control. a typewriter tabulating meehanism, eomprising'fa raek bar 245 movable on the frame of thetype writing machine, so as to bring of a series of settable studs on said bar into the path ofa std '27 on the carriage of the type- Writer. Sa'i bar 2% normally lies so that an ii'stud lti'on it will lie belhii the path of thestop 27 (see Fig. 12 Said bnr' isshi-ft able'o'n pins 29 by niean's of rdelf arm 21 fast on saidroek shaft 15 (seeFigiL 23) so as to he'swung lateral]? of the machine b{ said handle 10. For this purpose the roc arm 21 comprises a pin 22 working irf a slot 23 on said rack bar 22,1 and a'ssaid rfock arm swings, itlnow'es racit her 245 as se1i dotted lines in Fig. 15?, sethat'itrisesprr'the pins 29 by means of inelinesBO andraises said stud into the bath of stop27; The stud or stop 26 it Wil be seen, is along said" raek bar 24 means of openings 25 infsaid rack bar,- in any of which itniay be placed. L Q 7 7 If only a single column is to be tfi'pedgiild added; E only a ingle eulunin-sfiop 2G nju y be employed; biit if there: aretdb'e two eat umnstyped side by side on tlispirge, an; othercolumn-stop pin #26 may befset'lat' aii u'ppi'o' riate p'laee, forfoxiinipl e in t'het w eltt lj hole roar the illustrated stop Both column-stops would be normally t'otij w to reach the carriage-stop 27, biit iiiilt be brought up by themovement oi' ith e co iiinin' stop rod which is effected by the handle" to. Thusafter typing and adding afn urnber 'i i one eolnmn, the handle 10 would i'ltiliizetl' I'mpositioning both carria-gesat the proper decimal point in the second col unn'r; a'sd terniin'ed by the second ool ulfi'm stopf iti and then 'the operative woulfd pifobe'd to typ'eand add the desired number in thitfseeond cohfm tn The totzili zer wmfld slfoW the sum of the twonuinbers that"were sdtmiied on theisheet i" thiee c'dllinins" are t6 bl? tj petl and added, tliiee stops 26 maybe used, and so onl The carriage stop 27" niay he swungfs e Fig; on th'ej carriage to afi'i ex rntjde ire-mined by a pin-217" working'in a sldtffl'? 011'" said slit) 1, and tli'b length? o'f said slot so arrange with i'ei renee totlie widthfnf the stop 27, that thestopjti Will arrest sa-id carriage at the same pointfwliether the ear riage' is'trareling t d the ri-Qlit or to" left. A spring 27 norn'iafll y holds said slo "27 in position to arr'est the carriageas 'sa'ld earria'ge travels to thele'ft in letter-feeding direction. t V I When the computing machine carriage; of which the rack roerorms a part, hits been positioned by handle 10, aiidthe numeral keys are then operatedflso" as m carry into the computing wheels the desired nninhers; said raek is'fed ma as above described. by means of the dogs103'and10l.' Wheat-lie units I wheel is operated, saidnack is fed along one more space, and, in so feeding, an extension 126 of said rack strikes a stop 127 on a cross bar of the bail S4 and pushes said bail to the right, as viewed in Fig. 3, so that it slips off rock arm 83 andalso moves bail 86 by the striking together of the hubs of the two bails, so that said bail86 slips off rock arm 91. These bails are normally held in position over said rock arms by means of a spring 87 encircling rock shaft 82, and bearing against a collar on said rock shaft (see Fig. '3). This disconnects the computing mechanism from the typewriter, after writing the last digit of a number.

The tabulating handle 10, by varying the position of its coupling or looking bar 13, may 0 )eratenot only the tabulating mechanism a ove described, but also at the same time may position the computing machine carriage 99. For this purpose the locking bar 13 comprises a swinging stop 13 whie normally holds the position seen in dotted lines in Fig. 15, (also shown in full lines in Fig. 26), in which position, if said locking bar 13 is depressed, the tabulating mechanism alone will be operated, for said looking bar will engage only the hub 14. If, however, the locking bar 13 is depressed to the point shown in Fig. 15, said locking bar will engage both of hubs 11 and 12, and consequently tabulate both the t pewriter carriage and the computing mac ine carriage. A spring 13 normally holds said stop 13 in the position shown in dotted lines in Fig. 15. p

The computing mechanism may be restored automatically to efi'ective condition. When the computing machine carriage is brought toengage with a selected computing wheel by means of the handle 10, through the rod '52, as above described, a cam extension 1.51 fast on said rod (see Figs. 3, 3 and 5) passes under the bail 86, and raises said bail (see Fig. 35), and thereby the bail 84 is raised above the rock arms 83 and 91, and, when so raised, they are moved back into effective positions over said rock arms by means of the spring 87, above described; so that the com uting mechanism is restored from silenced condition to effective condition.

The bails 84; and 86 may be moved to ino. erative positions at any time by means of-the key or push-button 93, to which is fast a head 95 on the opposite end of spring plunger 91, in position to engage bail 84:. This disconnects the computing mechanism from the typewriting machine. 'For returning the bails 84 and 86 to operative positions at will, a lever 96 is provided, the inner end of which underlies an arm of. the zero key bail 86. Depression of the handle or key of this lever will restore the bails 84 and 86 to operative position irrespective of the tabulatiug handle 10=wh m the master wheel 33 is in computing position. The computing carriage may be fed to the right by the key 122, without a corresponding shifting of the typewriter carriage, after the computing carriage has been positioned by the arm 10, the key 122 being arranged to underlie an arm 123 (see Fig.4) fast on rockshaft 90, and rock said shaft 90 so as to operate the computing carriage escapement.

In order to prevent any error in the operation of the computing carriage escapement, when said carriage is moving to the left, after it has been positioned by handle 10, there is provided what is herein called an antibacklash escapement (see Figs. 6, 19, 20, 24, 25, 28 and 29). Said escapement, which is operated by the rock shaft 90, comprises a fixed pawl 103 fast on said shaft, a swinging pawl plate 105 loosely pivoted at 105 on an extension of said fixed pawl, and a swinging dog 104 which cooperates with fixed pawl 103 to feed the rack 102 along.

lVith every depression ofa numeral key (38, as seen in Fig. 5, the rock shaft 90 is swung by a bail 84, as above described, so as to rock the loose dog 104 out of engagement with the tooth on rack 102, and to rock detent 103 into engagement with the adjoining tooth. As loose dog 104 is swung-out of engagement with said rack (see; Fig. 28), it is snapped by spring 109 to a position opposite the adjoining notch in said rack (see Fig. 24) and, on the return stroke of said numeral key, said rock shaft 90 swings back, carrying loose or feeding dog 101 into engagement with the adjoining tooth; and then said rack is drawn forward by means of spring 111, pressing loose pawl 104 along until pin 108 on pawl plate 105 stops the swinglng of said pawl by means of a lug 107 on said pawl, when said rack has. moved the space of one tooth.

It will be thus seen that when; said rack is released from fixed pawl 103, it feeds along the space of onetoothafter it contacts with loose pawl 101. \Vhen said rack. 102 is drawn by setting rod 52, (seas to cause the master wheel to engage with computing wheels of higher denomination), and then released, said loose dog 10% is prevented from thus feeding forward the spaceof one tooth. This is acomplished by preventing sprin 109 from drawing on said loose dog 101 uring the adgustment of said rack effected by said set-ting rod 52. V

For this purpose a spring 116 (see Fig. 25), during the shifting of the rack. presses to the left, in Fig. 6, a plungerv 113, so as to force pawl plate 105 leftwardly by means of a pin 110 (see Fig. 25),'working in a slot in said plate. This spring 116 is stronger than the spring 109 (shown in dotted lines in Fig. 25), and so will prevent lessees said loose pawl or dog; 10.49,. from being drawn by said spring 109. Said. plunger. however, is normally kept in inetljectivc position by means of an arm 121 on settingrod 52. whichpresses on one. end of a lever 120 (see Figs. l and 24,), whose opposite end, as seen in Fig. 6, catches on a collar 119 on said plunger 118. and so draws said plunger to the right as seen. in Figs. 6 and 24. against the tension of spring 116. and in this wag gives the spring 109;),free play to normally operate said loose pawl 104.

hen however, the setting; rod is swung by the tabulating handle, it is drawn clear of said lever 120. and thus allows spring 116: to force pawl plate. 105 to the, left. as seen in Fig. 6. into the position shown in Fig. 25, and prevents the. swinging of the loose pawl 104 by means of spring 109. lVhen said setting rod 52 is released. the loose pawl 101, as viewed insaid Fig, 6, is at its extreme left-hand position (as shown in Fig. 25), so that whensaid setting rod 52 is released. the rack 10:! caught. by said pawl as though it were solid. pawl. This prevents the lost motion which would normally take place in feeding rack. 102 to the extent of. one tooth. on said rack. if it were not for said plunger .113.

In Figs. 16, 17. 18,33 and 31, is shown a hand-lever 171. which can be used to. manipulate the bails 81 and 86. in place of the push-button 93. and the lovers 9U and 122. This may be accomplished by mounting the lever 171 so that it is movable in. three directions to perform three separate functions. As shown herein. said lever is mounted on a plate 173. pivoted at 171 andcarrying bearings 17') in which said lever swings in a. vertical plane. while said plate 173 may swing in a horizontal plane. The rearwardly. upwardly-extending branch; the lever 171 has two arms 17%) and 176. 71111611 embrace pins or projections 84: and 86 fast on the adjacent hubs of the hails 86 and 84:,

respeetively. To. raise said bails/the lever 171 is raised]. causingtaam liito engage thepins 81 and 86 and swing: the bails ups wairdly. To rock the bail. Strzilsorieto operate the computing-machine carriage-rack,

the lever 17.1 depressed (as shown in 33). causing arm 176 to engage pin. 84%., while a bend in said arm 176 (see Figs 34). carries it clear of pin 86. so that bail 84 is not operated: by said lever 171 when de-. pressed. To swine. the bails 8-1 and 86' to the right. so that they drop into inoperative positions. the lever 171 isswung to the left. so that it turns on pivots 17s.; and a side of said lever engages the pin 86%: of: bail 86., moving said bails to the right and freeing them tirom the rock arms 91 and 83'.

To release the typewriter carriage. a key 170 on it rock armlfi may he depressedso as to raise the typewriter rack 160' out of the usual keys-controlled escapement (logs se n at XX at Fig. 1. and thereby enable said carriage to be drawn to the left, by its spring. The connections between the. rock arm 169 and said. eSfiapemelati rack 16 i clude a roc'k arm 1G2 comp-rising a head 161 arrimgedtounderlie said rack, alink Hit extending from saidroek. arm liiZ- tseeil ig. 21) to rock arn-i 165., and a rock shaft 166 carrying a rock; arm 16% joined by a. link 1417 to the key-lever. rock arm 169.

When it is desired to operate the machine so as to perform a. computation. andstlie numbers to be computed ares tohbe arranged in avertical column on the work-sheet. the; stop 13 and thelocking bar 13 are moved to the Fig. 15 position, so as to. eonnectthe tabulat-ingi mechanism of the computing at moment and typewriter. carriage to the talailrating handle 10. The handle is then moved leftward from itsnornial position. as seen in Fig. 2, until the pawl 1t; thereon engagesthe tooth of the-rack 2O corresponding to thehighrst denomination. in the nuns her to be computed. Said'llefiward movement of the tahwlati-ng handle 10 rocks. the shafts 11 and 15 simultaneously. the. latter through the intermediary ojfits connections. causing the stud on the. tabs-later rackliar 21 of the typewriter carriage to be moved into engaging relation with; the stop '2? fast on said carriage. so as to arrest thecarri-age in a corresponding denominational position zit-the depression of the carriage-releasekezv 170. (which is depressed While the handle-1G is still held in its actuatedpositionl The rocking oi the. shaft 11hr the handle 10 causes the 52 tomove .lPft\Wl'(-l*ll v\ as seen in Figs. Slaml 23. against thetensiion. of its spring th rough the .intermediahv of the armfashion. said rock shaft. and the link 51. During: saidi, leftward movement oi the; rod .5 11'h6;fil'ml 112 thereon engages the mast'nwheel carriage .99.; 1500. to move, the master wheel 33 iaitomenea-geiuent.with that deneminational element ot the. tetalizer which corresponds to thetootlm of the raclt 20 with which the pawl' 16min: tihelia nd le 10' is held inengagernemb.

Imeidenitalla, during said leftward moxie: naent ofthe rod fihlptlle pita 132 thereon. that is in engagement with the bell crank. 128 wiht roektthsfla-tiiler and the-lever .1341, with its ctamectedpawli 71.35.. to rotate the ratchet wheel 13 (Fig. 37)1.to wind up the spring motor. in amanner presently to. be deserihed: and this powerissubsequently to he ased 'to rotate the master wheel at. the. depressionef a numeral key.

For restoring-the computing mechanism etlectivecondiiition a cam 1513. on: rodi 52, simultaneonslpwith: the: denominational setting ofi themasteir wheeL-33i. engages the bail 8B (Fig;v 3). to: raise saidnbailatithe lelEtav ard movement of the rod 52, and. there 

